Hi Greg,
Thanks for the kind & prompt response. What you mentioned is correct; but this kind of provision in IPv6 framework has resulted in more complex implementations.
Eg., if PPP server would have allocated
one prefix to PPP client (in IPv6CP) then the client would become a globally routable
host; and the PPP client might use this prefix as per his requirements;
and multiple prefix allotment could also take place in the same way as
defined in IPv6 RFCs!
But since things are not defined in this way, PPP client and server both have to have DHCPv6 client/server implemented on them; making both the systems (PPP client & server) more complex!
Thanks & regards Rajan
From: Greg Daley <[EMAIL PROTECTED]> Reply-To: [EMAIL PROTECTED] To: Rajan Srivastava <[EMAIL PROTECTED]> CC: [EMAIL PROTECTED] Subject: Re: IPv6CP - rfc 2472 --- why only IID, why not prefix too Date: Thu, 25 Nov 2004 13:09:05 +1100
Hi Rajan,
Rajan Srivastava wrote:Hi,
In rfc 2472, it is provisioned that PPP server will negotiate
interface identifier with PPP client, server will not pass on network prefix;
and prefix delegation is left for DHCPv6 etc.
What is rationale behind this strategy?
IP(v4)CP believes that the peer PPP device can only have one address.
In IPv6, there's a lot more flexibility regarding prefix utilization on a host or network.
IPv6 Link-Local addresses have a fixed 64 bit upper portion, and so the 64 bit token used for IP6CP may be usable to generate a valid Link-Local address.
Such an address can then be used in DHCP, or Neighbour Discovery.
Since Router Discovery (part of Neighbour Discovery) can provide multiple prefixes to a host, any one or more of these prefixes may be used to autoconfigure an address.
As you mentioned, prefix delegation caters to another set of devices: those requiring networks/prefixes of addresses.
Each fills its own requirement, and it doesn't necessarily make sense to define another way to do this in IP6CP, since the assumptions are different to IPv4.
Yours Sincerely,
Greg Daley
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